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首页> 外文期刊>Weed Technology >A Comparison of Reduced Rate and Economic Threshold Approaches to Weed Management in a Corn–Soybean Rotation
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A Comparison of Reduced Rate and Economic Threshold Approaches to Weed Management in a Corn–Soybean Rotation

机译：玉米-大豆轮作中杂草减免率和经济阈值方法的比较

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摘要

A field study was conducted at two sites in southwestern Ontario, Canada, from 2002 to 2005 to assess the cumulative effects of different weed management strategies applied to the same plots over time in a corn–soybean rotation. These strategies included a POST broad-spectrum herbicide applied at recommended or reduced rates and use of a computer decision aid to select the POST herbicide having the greatest net return (economic threshold approach) based on weed populations before treatment or seed-bank estimates. Four years after study initiation, increased weed populations were observed only in the nontreated control. The reduced rate and economic threshold approaches did not lead to increased weed seed banks compared with the recommended rate of a broad-spectrum herbicide. Reductions in herbicide rate were more effective than the use of economic thresholds for reducing the risk of environmental impact in corn and soybeans. Weed populations in this study were generally above threshold levels, and herbicides selected by the computer decision aid tended to be older, less-expensive herbicides with high use rates. Recommendations by the computer decision aid were generally more effective and more profitable when based on weed populations before treatment than when based on seed-bank estimates.
机译：2002年至2005年，在加拿大安大略省西南部的两个地点进行了田野研究，以评估不同的杂草处理策略在玉米-大豆轮作中应用于同一块地的累积效果。这些策略包括以推荐或降低的比例施用POST广谱除草剂，并使用计算机决策辅助工具根据处理或种子库估计之前的杂草种群选择净收益最高的POST除草剂（经济阈值法）。研究开始四年后，仅在未经处理的对照中观察到杂草种群增加。与广谱除草剂的推荐使用率相比，降低的使用率和经济阈值方法并未导致杂草种子库的增加。降低除草剂率比使用经济阈值降低玉米和大豆的环境影响风险更为有效。这项研究中的杂草种群通常都超过阈值水平，并且通过计算机决策辅助工具选择的除草剂趋向于是年纪大，价格便宜，使用率高的除草剂。与基于种子库的估算相比，基于处理前的杂草种群，计算机决策辅助工具的建议通常更有效，更有利。

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